FromCharacterCode[n] gives a string consisting of the character with integer code n. FromCharacterCode[{n_1, n_2, ...}] gives a string consisting of the sequence of ...

Replace[expr, rules] applies a rule or list of rules in an attempt to transform the entire expression expr. Replace[expr, rules, levelspec] applies rules to parts of expr ...

Representations of real intervals. This represents all numbers between -2 and +5. The square of any number between -2 and +5 is always between 0 and 25.

Nested logical and piecewise functions can be expanded out much like nested arithmetic functions. You can do this using LogicalExpand and PiecewiseExpand. Expanding out ...

If you use a text-based interface to Mathematica, then the input you give must consist only of characters that you can type directly on your computer keyboard. But if you use ...

Repeated patterns. Multiple blanks such as x__ allow you to give patterns in which sequences of arbitrary expressions can occur. The Mathematica pattern repetition operators ...

Unix mailbox format. Holds a collection of electronic mail messages. Native archive format of email clients such as Unix mail, Eudora, Mozilla, Netscape, and Thunderbird. ...

MIME type: image/x-portable-graymap PGM grayscale raster image format. Member of the Portable family of image formats. Related to PBM and PPM. Implements a subset of the PNM ...

MIME type: application/nd.sun.xml.calc OpenOffice 1.0 spreadsheet file. Stores spreadsheet data and formulas. SXC is an acronym for Sun XML Calc. Native spreadsheet format of ...

ImageData[image] gives the array of pixel values in image.ImageData[image, " type"] gives the array of pixel values converted to the specified type.